Oil Pressure Light
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Senior User
Joined: Jan 2011
Posts: 145
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From: Dothan, Alabama
Oil Pressure Light
It has not done in the past or least I haven't noticed..My gauge on oil pressure normally slightly low...on N or O of the wordtruck normal..I have a 351m...I know they are notorious for low pressure...but when I sit at a red light for a couple mins...my oil pressure gauge drops past L as if the truck is off...then when I press the gas it slowly goes up to its normal resting place...what's this mean?
Post Fiend
Joined: Jan 2006
Posts: 5,037
Likes: 9
From: Kasson, Minnesota
I agree with sticking a mechanical gauge and see what exactly you have. Stock gauges are very unreliable and no sense trying to trouble shoot until you know what kind of pressures you have.
Junior User
Joined: Sep 2011
Posts: 67
Likes: 0
X3 on a mechanical gauge. My factory gauge would read normal at cold start and then quickly head down to nothing on my 351m. I thought I was screwed but after reading over and over again on this site not to trust the factory gauge I finally got a mechanical one installed and my oil pressure is actually fine. 20psi hot idle 40psi at 40 MPH etc. Do yourself a favor and don't stress about this until you have checked it with a mechanical gauge.
Moderator & parts slinger
Joined: Feb 2007
Posts: 50,186
Likes: 5,792
From: S/W Missouri, Polk county
Get a threaded "T" fitting that goes in and before the before the factory sending unit (so you can still run the factory one) and that hooks a oil line directly to your aftermarket gauge. Brand is your call...
And some power to light the gauge at night when the park/head lights are on, and its not permanent by no means.
And some power to light the gauge at night when the park/head lights are on, and its not permanent by no means.
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